Most vintage, high mid, P bass sounding soapbar pickup

I’d probably start with Nordstrand BigSplits. Not really vintage P, but still a fat split coil, about as close as you can get to a P in a soapbar... other Nordstrand Big series pickups might also fit the bill...

Series dual coils might also work for you. While in parallel dual coils can sound more hi-fi and modern, they have more grunt and mids in series. Aguilar duals are hardwired in series, and Nordstrand has a set optimized for series.

 

Since you have to solder the wires, it takes about the same to install them. The difference is that you have to figure out which wires go where. See the diagrams here, under "docs": Nordstrand Series Wind Dual Coils - Best Bass Gear